-
公开(公告)号：JPH0359487A
公开(公告)日：1991-03-14
申请号：JP19557989
申请日：1989-07-28
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To easily change by one instrument between the measurement of various dosage equivalents before the revision of the law and the measurement of an irradia tion dosage before the revision by applying or stopping a voltage to a compensation ionization part by the switching of a voltage applying circuit. CONSTITUTION:A measurement ionization part 10 has an incidence window 14a for radiation measurement and applies a specific voltage to collect ionized charges to a current collecting electrode 18a. Further, the compensation ionization part 12 with specific-volume-ratio capacity which is formed at a position opposite the reverse surface of the incidence window 14a of the ionization part 10 has an application electrode 16 with the opposite polarity from the application electrode 14 of the ionization part 10 and the collecting electrode 18a limits the transmission of radiation. Then a partition plate 18 between the ionization parts 10 and 12 absorbs radiation incident on the ionization part 12 and an electrometer 20 connected to the collecting electrode 18a between the ionization parts 10 and 12 measures a collected current corresponding to an incidence dosage. Then the voltage applying circuit is switched to measure the dosage equivalent or irradiation dosage optionally according to whether or not the electrode 16 of the ionization part 12 is applied with the voltage having the oppo site polarity.
-
公开(公告)号：JPH0312579A
公开(公告)日：1991-01-21
申请号：JP14770089
申请日：1989-06-09
Applicant: ALOKA CO LTD
Inventor： OKADA TOICHI , OOWAKI SHIGEHIRO , OKUMA JUZO , SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To execute the measurement in a real time and with high sensitivity by a miniature device by scavenging a radioactive material in the measuring air led into a flow part, and bringing its radiation dose to doubly integrated dosage measurement by a detector placed on the opposite side of a scavenging body. CONSTITUTION:In the inside of the upper half 100a of the body, a flow part 10 of measuring air is formed, its bottom part is closed up by a scavenging body 12 and the flow part 10 is formed like a closed case. On the other hand, in the inside of the lower half 100b connected to the upper half 100a with a hinge 24, a radiation detecting part 20 is formed, conductive packing 36 is provided on an abutting part to a frame 32 of the scavenging body 12, and a collecting electrode 22 is held in a space part. Subsequently, the scavenging body 12 is constituted by supporting a scavenging plate 30 formed by sintering a scavenging material together with clay mineral, and placing a mesh electrode 34 on the lower face. In this state, when a radioactive material in the air led into the flow part 10 is scavenged 12, the detecting part 20 partitioned and formed from the flow part 10 integrates and measures ionization charge generated by an incidence of a radiant ray, and by the doubly integrated dosage measurement for calculating the radiation dose, while scavenging the radioactive material, the measurement can be executed with high sensitivity.
-
公开(公告)号：JPH01134291A
公开(公告)日：1989-05-26
申请号：JP29229887
申请日：1987-11-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To measure an effective dosage equivalent or 1cm-deep part dosage equivalent by a scintillation counter by providing windows which differ in thickness. CONSTITUTION:Small circular parts of berryllium are scattered over the entire surface of an aluminum plate, a 1st incidence window 34 where a radiation in a low energy area can be incident is arranged in front of a scintillator 32, and a 1st detection part 26 where a photoelectron multiplier tube 36 is provided across a quartz glass plate 14-1. A scintillator 42 which is a half as large as the scintillator 32 of the 1st detection part 26 is arranged across a 2nd incidence window 46 which is thick enough to increase the dose rate meter from an energy area of about 300keV to a high area. The photoelectron multiplier tube 46 is arranged on the scintillator 42 across quartz glass 4-2 to constitute a 2nd detection part 28. A difference computing element 50 calculates the output difference between the detection parts 26 and 28. A shield plate cap 56 composed of a plastic plate for effective dosage is provided. Consequently, the effective dosage or 1cm-deep part equipment is measured.
-
公开(公告)号：JPH01134289A
公开(公告)日：1989-05-26
申请号：JP29229787
申请日：1987-11-19
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
Abstract: PURPOSE:To measure substantial dosage in consideration of an influence upon a living body by an ionization chamber by providing windows which differ in thickness. CONSTITUTION:This dose rate meter is provided with a 1st detection part 24 having a 1st incidence window made of a thin window where a gamma ray and X ray having low energy are incident, a 2nd incidence window 32 having intermediate thickness where rays larger than intermediate energy are incident, and a 3rd detection part 28 having a 3rd incidence window 34 which is thick energy to make high-energy rays incident. Application electrodes 24b (24d) and 28b (28d) of the 1st and 3rd detection parts 24 and 28 are used as cathode, the application electrode 26b (21d) of the 2nd detection part 26 is used as a cathode, and the output of the 2nd detection part 26 is subtracted from the sum output of the 1st and 3rd detection parts 24 and 28. A shield plate cap 38 for deep part dosage which is made of a plastic plate is provided covering the 1st incidence window. Consequently, the 1cm-deep part dosage equivalent and effective dosage equivalent can be measured.
-
公开(公告)号：JPS6352760B2
公开(公告)日：1988-10-20
申请号：JP2723782
申请日：1982-02-22
Applicant: ALOKA
Inventor： KOBAYASHI HIROSHI , ICHINOKAWA TAKEO , SATO HIROO , MAEKAWA HIROSHI , NAKAOKA HIROSHI
-
Patent Agency Ranking
公开(公告)号：JPS63118699A
公开(公告)日：1988-05-23
申请号：JP26496886
申请日：1986-11-07
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
IPC: G21F9/32
-
公开(公告)号：JPH06258443A
公开(公告)日：1994-09-16
申请号：JP4929993
申请日：1993-03-10
Applicant: ALOKA CO LTD
Inventor： ONO TAKESHI , MITO MASAYASU , SATO HIROO
Abstract: PURPOSE:To measure radioactive elements in a gas efficiently by providing an adsorptive substance in an ionization chamber. CONSTITUTION:Air is sucked into a dust filter 10 where relatively large dusts are removed. An ionization chamber 30 comprises an adsorptive substance 32 arranged on the inner surface thereat, a meshed electrode 33 arranged farther inside, and a current collecting electrode 34, wherein a high voltage is applied between the electrodes from a DC power supply 22. A pump 16 produces a negative pressure in the ionization chamber 30 and the air passed through the ionization chamber 30 is discharged to the outside by means of the pump 16. When atoms of the gas are ionized by alpha-rays emitted from radon, electrons are captured by the current collecting electrode 34 which feeds a current to a vibrating capacitor electrometer head 24 where the signal is amplified and further amplified by a charged current amplifier 36 before it is recorded in a recorder 28.
-
公开(公告)号：JPH0579952B2
公开(公告)日：1993-11-05
申请号：JP10559588
申请日：1988-04-28
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
-
公开(公告)号：JPH05209965A
公开(公告)日：1993-08-20
申请号：JP1550392
申请日：1992-01-30
Applicant: ALOKA CO LTD
Inventor： ONO TAKESHI , MITO MASAYASU , SATO HIROO
Abstract: PURPOSE:To easily and quickly obtain the density of beta nuclides for each type thereof by finding a real peak value via the correction of the measured peak value of each nuclide available from judgement about a beta ray spectrum detected and prepared from a sample. CONSTITUTION:An arithmetic circuit 24 prepares the measured spectrum of betarays detected with a detecting section 10 and, for example, retrieves the peak value of each of H, C and P. Also, measured peak values are identified for each of the peak values and stored in a data memory. At the same time, the circuit 24 identifies the type of a nuclide contained in a sample on the basis of each measured value, and deducts the mutual contribution factors of nuclides from each measured peak value, while assuming a spectrum for each identified nuclide. Real peak values are thereby computed. Furthermore, respective real peak values are multiplied by the inverse number of counting efficiency, thereby obtaining the accurate density of each type of nuclide.
-
公开(公告)号：JPH0553384B2
公开(公告)日：1993-08-09
申请号：JP18927689
申请日：1989-07-21
Applicant: ALOKA CO LTD
Inventor： SATO HIROO , MITO MASAYASU
-
-
-
-
-
-
-
-
-
Search Results
69
records
(took 0.017 seconds)
